[QUOTE=Engine49guy;141057811]As the guys have stated a four inch 4 or 5 screw M27 is a rare beast.
While the 3.5" and 5" Model 27's were prolific in the 50's 60's and early 70's they fade out in the mid late 70's being supplanted by the 4" versions .
That being said IMO there were alot more 3.5" and 5" Model 27's made than 4"versions.
As far as premiums they generally favor any earlier 4 or 5 screw variant even though the 4" 27-2 is less commonly encountered.

Btw, I personally prefer a 4" Model 27 over the 3.5" or 5" versions,
( If anyone out there reading this has a clean 4 or 5 screw pre 27 and pines for a 3.5" or 5" drop me a pm and I would gladly do an even Steven swap).

I have a special order 4 inch pre-27 that I’d consider selling or trading. It shipped November 9, 1956 to H.H. Harris Co., Chicago, IL, as I think most did. But an even swap for 3 1/2” or 5” wouldn’t begin to come close. Maybe several. Actually, I collect .44 Specials and would be more interested in trading for them.

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SWHF #691