By the ad file, in 1970 Bucheimer changed the outboard strap from being sewn on to being integral to the body of the holster - the New Federal Man - as did Safariland at about the same time.
The strap with the snap is new to me, but I'm not a Bucheimer expert. Is it a real snap or a fake snap - a rivet? It might be an owner modification.
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These are two versions of fit chart for the Federal Man from the master thread.
Bucheimer Federal Man 1960's
200 = Colt D Det. Spec Cobra 2"
210 = Colt D Marshal 2" High Standard 2 ½"
440 = Colt D Det. Spec Cobra 3"
290 = Colt I .357 Python 2 ½"
490 = Colt I .357 Python 4"
690 = Colt I .357 Python 6"
690 = Colt I .38 Officers Model 6"
400 = Colt I Marshal, Hi Standard 4"
500 = Colt I Marshal 5"
600 = Colt I Marshal, Hi Standard 6"
440 = Colt D Police Positive 4"
540 = Colt D Police Positive 5"
640 = Colt D Police Positive 6"
410 = Colt Scout 4 ¾"
570 = Colt SAA 5 ½"
230 = S&W J Chief, Kit Gun 2"
330 = S&W J Chief, Kit Gun 3" 3 ½"
250 = S&W K Mdl. 10 2"
350 = S&W K Mdl. 10 4"
450 = S&W K Mdl. 15, 19 4"
650 = S&W K Mdl. 14, 19 6"
420 = S&W N .357, 1950 3 ½" 4"
520 = S&W N .357, 1950 5"
620 = S&W N .357, 1950 6" 6 ½"
610 = S&W N Mdl. 29 6 ½"
830 = S&W N .357 8 3/8"
470 = Ruger .22 Single Six 4 5/8"
560 = Ruger .22 SS, Hi Standard Dbl. 9 5 ½"
580 = Ruger .22 Bearcat
670 = Ruger .22 Magnum SS 6 ½"
1410 = Ruger .357 BH 4 5/8"
1640 = Ruger .44 Mag. 6 ½"
280 = H&R
630 = H&R 2 ½"
680 = H&R 6"
660 = H&R 4"
710 = H&R 999
Bucheimer Federal Man 1970's
200 = Colt Det Spec Cobra 2"
201 = Colt Det Spec Cobra 3"
205 = Colt Diamondback 2 ½"
210 = Colt Diamondback 4"
215 = Colt Python
220 = Colt Python, Trooper MK III 4"
225 = Colt OP, MK III
230 = Colt Police Positive 4"
300 = S&W Chief, Charter Arms 2"
301 = S&W Chief, Charter Arms 3"
305 = S&W Regulation Police 4"
310 = S&W Mdl. 19 2 ½"
315 = S&W Mdl. 10,12,15 2"
320 = S&W Mdl. 10, 12, 15 4"
325 = S&W Mdl. 15, 19 4"
330 = S&W Mdl. 57, 58, 28, 29 4"
250 = Colt Commander
255 = Colt 45 Gov't, 38 Super
355 = S&W Mdl. 39
400 = Browning High Power
450 = Walther P38
455 = Walther PPKS