Lawrence 603 is for a "Ruger .357 Mag, 6 1/2"
Model 100B for basketweave.
What a fine gift!!

Years ago one could find nice holsters on Ebay for reasonable prices and I found several half-flap, or "Speed Flap" there. Revolver holsters were not particularly desirable. Not so much any longer. N Frame with Deer Lodge Prison horsehair braided hat band and K frame with fringed buckskin gauntlets. Both holsters lined Lawrence.