Question on a Rock-ola Operating Slide

[USGI]

My new (to me) IBM Carbine has a (Riesch) Type 3 slide. The marking on the bottom is ROCK-OLA with an X underneath. I found that marking in the book, but according to the listing it shouldn't be on a Type 3. Have I got something unusual, or is the book incorrect on this?

Thanks! Bob

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[USGI]

Does anyone know what the "x" stands for? Thanks, Bob

[painter777]

I have 3 RMC type III slides here all marked Rock-Ola exactly where yours is... but no X.
No idea what the X stands for.

Charlie

[dbarn]

Bob,

Only found one place this was referenced. NL #65.

Rock-Ola was moved to outside bottom location somewhere before serial #1681xxx. Later the marking was changed to Rock-Ola X on the outside bottom. The X shows up in the 1696xxx and 1697xxx range. The round cut on the box was discontinued sometime before the marking was moved to the outside bottom location.

The X was dropped from the marking before completing the block of numbers ending with 1762519. Sorry there was not more. hth.

[USGI]

This slide is on the IBM I just picked up, but still wanted to know. Thanks for looking all this up for me! - Bob