I found it, Hondo44s info, on these fixed sight SS....
Stainless Steel Single Six fixed sight models:
Hi Jim,
My info ctr is your info ctr, ask me anything, anytime.
Yes they did! But no 9 ½" length. Of course the 4 5/8" is the scarcest as usual.
1994 1st production, marked Ruger Single Six .22 Cal. on frame:
GKNR5F, 5 ½",500 made
GKNR6F, 6 ½", 500 made
1995 production:
GKNR5F-I (Ivory grips, scrimshaw black eagles, no medallions) Special distributor model 1206 made
1998 production, marked RUGER .22 CAL. NEW MODEL SINGLE-SIX:
GKNR4F: only 3 MADE!
GKNR5F: 2600 MADE
GKNR6F: 1100 MADE
2002-2004 production:
KRB-24FW (Bisley .22 4 5/8" Fixed sight With engraved cyl) Special distributor model 945 made
Thru 2005 clean up guns:
GKNR5F: ~300 MADE
GKNR6F: ~300 MADE
There you have it, and we all need help!! Totals 4,606 R5Fs and 1,900 R6Fs.