OK. Attached are photos of the fronts and backs of 5 smaller size wrenches, all -v-. From top to bottom:
#1. 1/4 x 5/16 DOE
#2. 3/8 x 7/16 DOE skinny
#3. 3/8 x 7/16 DOE fat
#4. 3/8 x 7/16 DBE
#5. 7mm x 9mm DBE
#1 seems to confirm that a single logo line was used on both sides because of the difficulty in properly centering the characters on the small size panels. Note how low on the panel the USA side is stamped. If this had been a double line, it would have been a mess. This also re-enforces Jim C.'s suggestion that these are still double-line era wrenches, since it's obvious why the double line could not have been used here.
#2 and #3 are the same size wrench, both -v-, but #2 is a skinny. Note also that the #2 has a pointed top A whereas the #3 has a flat top A. It suggests that the pointed A corresponds to the earlier skinny style with the flat A being the later fat. However, this alone may not be able to distinguish between what is normally considered =v= and -v-. Many more examples would need to be examined. But it appears that pointed A vs flat A and skinny vs. fat may actually be more accurate in dating a wrench than considering =v= or -v-.
#4 is pre-model number. Smaller size, so we'd expect the single line. However, it's also apparent that because it's a DBE, there was no end flat on which to stamp the sizes, so they had to go on the panel. In this instance, there is no attempt to express either a single or a double line as a detail of the logo design because there was simply no room. The line is then relegated to a little dash to the left and right of the v, serving here more as a delineater between adjacent characters than actually being intended as part of the mfr code. This has a flat A.
#5 is a long pattern DBE, so the panel has enough room for lines, but because it is a small size only a single line is used, and appears to be used as part of the logo design. On both sides the lines extend from the center Craftsman and USA out to the sizes, just like a logo, but with only a small break in which to insert the v. this one also has a flat A.
I do not have enough examples to determine whether or not #4 and #5 are skinny or fat, so this is a detail that needs to be confirmed by someone else's examples. But if the supposition is correct that the pointed A is skinny and the flat A is fat, then both these should be fat examples. If they are not, then this is not a solid correlation either.
Interestingly enough, of all the combo Cman v wrenches I have that are 5/8 or larger, the only =v= I can find are those with no model numbers. All the -v- I have all have model numbers. This also suggests that the double dash or single dash has more to do with the size of the wrench and the available space on the panel than if it were made during a specific set of years. It suggests that in reality there is only a v code that covers all the Moore/Easco years--there is no =v= or -v-.
I easily have close to 200 wrenches that are -v- marked. When I went back over them now, I was surprised to find out that every larger wrench 9/16 and up that has a -v- either has the model number also on the panel or the wrench sizes on the panel. If there is no such thing as a -v- mark on a 9/16 or larger wrench without model or size numbers on the panel, then we have for years been looking at this v code business all wrong. The difference between =v= and -v- may then have nothing to do with the year it was made, but only with the available space on the raised panel.
This mioght also explain why so many members have reported having sets that were bought whole having a mix of -v- and =v= wrenches.
Another correlation that apparently needs to be tied down is if there is a hard relationship between pointed A /skinny and flat A/fat. If there is, we may be able to tie down an aspect of dating these wrenches.
Am I on to something here?
Please look at your collection and see if you can find a larger size -v- without sizes or model numbers on the panel!