The tang stamp on the main clip blade indicates 1970s vintage (with the 'dots' underneath the 'U.S.A.' marking). Count the dots, and subtract from 10 to get the exact year past 1970 (ten dots that year, subtracting one dot each year thereafter).
Here's the quirky part. The small blade in the 3rd pic shows the 'long-tailed C' in 'CASE' with 'TESTED XX' underneath (see image of stamp below). That's an older blade swapped in, most likely. The visible pivot pin might indicate/confirm a blade was replaced (re-pinned) in that position. The stamp on that blade is from the latter part of the 1920-1940 era (so-called 'TESTED' era). The collecting guide I refer to(
*) indicates that stamp as coming in a period from 1932-1940, though it's possible it might've come earlier (by Case's own tang stamp dating page, here -->:
http://www.wrcase.com/case_college/tang_stamps/ ).
Edit:
As mentioned, the pattern is indicated by the '6347 HP' on the sheepsfoot blade shown in the 2nd pic. Pattern numbers weren't stamped on Case's blades until after 1949. The collecting guide also indicates Delrin handles occurring in 1970s or later, on this pattern. The presence of the pattern stamp, plus the 'dots' on the main clip blade and the delrin handles, all would seem to confirm it's likely a '70s vintage knife, aside from the older blade being swapped into it at some point.
* = The '
Official Price Guide to Collector Knives', Fourteenth Edition, by C. Houston Price; 2004
David
