I'd appreciate if someone could let me know what kind of timeframe or number that were made with the smooth coating, grooved (not checkered) handle, with the screws holding the slabs on rather than the pins. This was right around the time Jerry almost blew his hand off, but haven't seen many straight SHIIs with grooves and screws.
You've raised a good question. I did a post on SH lineage a while back, but I did not tackle that or some similar questions. I believe the smooth handles came first, and at the very first they came with solid pins (two with the orig. SH and three with the SH2). I believe that screws came after that, and then the tubular handle fasteners.
I have a picture of an A2 SH2 with smooth handles and screws, but I also have a picture of an INFI (I think) SH2 with smooth handles and screws.
However, I also have a picture of a SH2 (unless I otherwise mention, I mean an INFI SH2) with smooth handle slabs and the tubular handle fasteners, and a CRINKLE-COAT! That's one special SH2. It's Gator's SH2, I believe; perhaps he could educate us on its origins. NOTE: nevermind, I just found out that Busse refurbished that one and put the crinkle coat and tubular handle fasteners on it (it was originally a smooth handled SH with screws). So, that mystery is solved.
Another mystery to me is the swirl-pattern texturing that appears on some SH2's. The only two (picture) examples I have of these SH's both have the tubular handle fasteners (and the smooth black blade coating). I wonder if the swirl-pattern was a special run, or just a very limited run right before the diamond-cut pattern on the E models. Anyone know?
Here's my current view of the lineage of the handle slabs and screws on the SH:
1.) smooth handles, solid pins
2.) smooth handles, screws
3.) grooved handles, screws
4.) grooved handles, tubular fasteners
5.) (maybe) swirl-pattern texturing, tubular fasteners
Back to your question. I'm really not sure of the time-frame, but I doubt they are very rare, but also not as common as the tubular type. I'm just not sure. As you can see, it's a rather complicated issue. Perhaps Jerry would be kind enough to enlighten us all?