Jim,

Always happy to help. I have the following:

Mark II, 1st Triple-Lock .455 SN: 930 cylinder measures 1+5/8", Barrel top: 2 line address newest date Feb '06
no roll stamps what so ever on sides of barrel, (no S&W, no caliber marking), no SN inside recess for ejector rod on barrel.
Cylinder SN: 930 matches

Mark II, 2nd, .455 SN: 27536, cylinder also measures 1+5/8". Barrel Top: 2 line address newest date Feb '06
Left side of Barrel "SMITH & WESSON .455" all nos. match

1+5/8" is by steel tape rule not micrometer so figure nominal (+/-) variance. If you need me to mic the cylinders, just ask.

Both are in original .455 configuration, properly "proofed".

Chamfers inside cylinders are visibly pronounced at proper depth, nice & shiny inside chambers.

Triple lock is at least a 90%+, 2nd Model is at least 95%+ condition.

Both have been in the family collection at least 20 years likely closer to 30 years.

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ANTIQUESMITHS
LM1300 SWHF425