A really nice gun, and I congratulate you on that 'find'.
The star is a factory rework/refinish mark.
Numrich sells the lock-pins and the tiny springs.
Take a small, barbed (straightened) fish hook and see if that spring is still in the hole...most times it is
, stuck in place by dried oil and grease.
The best pin you'll ever find is a drill-bit the proper size.
Heat it cherry-red (to soften the temper), then cut and smooth /radius the cut end.
Re-harden, blue it, and install.
The tiny springs in lighters work real
well, if yours is gone.
Grip-wise, the old pencil-marked grips are the devil's own to read.
Generally the numbers are very big, very 'script-like', and only show up under a bright, 'daylight' fluorescent light.
Many times, if the gun was refinished, the grips were rubbed and cleaned, and there goes the mark.
were marked when new, either.
As for the caliber conversion, I like
the fact that it will be a good shooter, with readily-available, conventional ammunition.
IMHO, the current state of ammo availability and cost should give us a look into the future of limted-production, obsolete caliber ammunition.