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NM Blackhawk Convertible markings

This is a discussion on NM Blackhawk Convertible markings within the Ruger Single Action forums, part of the Pistol & Revolver Forum category; I recently traded for a NM Blackhawk convertible in 357/9mm. The 9mm cylinder came with some interesting markings I had never seen before, the cylinder ...


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Old February 29th, 2020, 12:04 PM   #1
 
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NM Blackhawk Convertible markings

I recently traded for a NM Blackhawk convertible in 357/9mm. The 9mm cylinder came with some interesting markings I had never seen before, the cylinder was stamped "Kal. 9mmP". It was also stamped with an odd set of initials that almost look like an F on top of 2 W's. This was also engraved very small on the right hand side of the frame. Additionally 4 numbers were free hand engraved on the cylinder face, poorly I might add. 3 of the 4 are the last 3 digits of the serial number. Serial number puts its make in the first 2 years of manufacture for NM Blackhawks. A request for information has been sent to Ruger, just curious if anyones seen this before? I'm not expecting or saying this is some super rare collectors item either, just a unique owners modification.
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Old February 29th, 2020, 01:28 PM   #2
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I only have one 9mm cylinder and it is not marked.

Perhaps it means 9mm Parabellum?

It's also interesting there is a matching proof mark on the cylinder and the frame.

My best guess would be an aftermarket cylinder that was fit for that revolver by someone other than Ruger and they placed their mark on it.

It would be interesting to check with Ruger and see if it came from the factory with the 9mm cylinder.

What's Iowegan's two cents?

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Old February 29th, 2020, 07:11 PM   #3
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I've never heard of a factory marking like that. My guess …. it was done by a former owner. "Kal" is common in Europe for "caliber" so it probably means 9mm Parabellum Caliber. The electric pencil etched numbers on the cylinder's front face are common …. typically with such poor penmanship that it's hard to read.

I have an Old Model 1972 vintage NM 9mm/357 Convertible that has an "S" stamped on the rear face of the cylinder (12 o'clock position in the photo). This is a "proof mark" that indicates the gun was factory test fired with high pressure proof load ammo. The front of the cylinder has the last 4 of the serial number but you have to be skillful to read it.

Here's my OM 9mm/357 Convertible:



I also have a New Model 9mm/357 Convertible with the same markings …. except the last 4 of the serial number on the cylinder's front face are different.

Here's my 1981 vintage NM 9/357 Convertible:

Last edited by Iowegan; February 29th, 2020 at 07:29 PM.
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Old March 2nd, 2020, 12:57 PM   #4
 
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Ruger emailed me back, stating that my revolver was shipped in October of 1974 as a convertible with both a 357 and 9mm cylinder, meaning that the 9mm likely is original. I would assume it as as the timing and lockup is correct and tight. It did not state where it was shipped to though, I'm assuming for that info I'd have to pay for an actual letter.
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Old March 2nd, 2020, 02:47 PM   #5
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That sure doesn't explain the strange stamping. Maybe it was shipped to Europe and came back. The mystery may never be solved.

That is a nice revolver.

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Old March 5th, 2020, 11:15 AM   #6
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Years ago, I bought a blued 357 Blackhawk from a popular dealer in my area. When I got the gun home, I found each chamber in the cylinder was punch marked with numbers 1~6. I knew this wasn't done at the factory so I asked the dealer and found out they stamped the numbers at the request of a different customer that changed his mind and bought a different gun. Point being …. when you see markings that were not done at the factory, it could have been done by the dealer or a previous owner. BTW, I have also bought guns that were supposed to be brand new, only to find they had been previously owned and not fired.
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Old March 5th, 2020, 12:08 PM   #7
 
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Looks like 'acceptance markings' for a Europeon country would have to go through a proof mark book, yes some guns did get shipped overseas...if they went to a country itself had to be "accepted/proof marked" if it went to a military PX then not done......so my bet it was brought home home back then by a GI serving in Europe.....used to be the ladies in the records department ,some worked for the foreign sales overseas shipping (Export) and yes Rugers did go all over the world...maybe a new letter would be more "complete" with the info you seek,,,again try a "proof marks" books or the back section of a Blue Book around pages 2482 or so.....
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