Assuming it has a blued finish it would indeed be a Model 12 FV.
As for determining the screw spacing, see this FAQ article:
http://www.savageshooters.com/conten...Action-Lengths
The spacing is measured from the screw in front of the trigger guard to the forward most screw (just forward of the ejection port) as shown in the photo's in the above article. The rear screw under the tang is just a wood screw to secure the rear of the trigger guard.
As for the model numbers, they're pretty much all the same. Two-digit numbers are short-actions and three-digit numbers are long actions. The different numbers (i.e. 110, 111, 112, etc.) just denote the different series' which have different features/options (stainless steel v. blued; synthetic v. hardwood stock; heavy v. sporter barrel). The only discernible difference between any of the actions is in the adjust-ability of the AccuTrigger. All non Target/Competition Model 12/112's and Model 10/110's in the Law Enforcement line have the "varmint" AccuTrigger that is adjustable down to 1.5 pounds. Target models come equipped with the 6oz. "target" AccuTrigger (red blade). All other models come with the 2.5 pound "hunting" AccuTrigger.
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