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« on: July 01, 2014, 01:43:04 AM »
I believe that it is an ABI anchor. They made two sizes in manganese bronze if I remember for a short time in the 70s or 80s and that fits with the period you mention. One of those sizes was 55 lb, which would be stamped on the anchor near the center of the shank with the ABI logo.
A little more research turned up the following:
Bronze Star also offered these. The sizes were 35, 55 & 75 lb. They are listed in a catalog I have from 1991/1992. They are in the ABI catalog from 1992 in galvanized steel. You can identify it positively with these dimensions. Shank length 39", Stock length 37.5", fluke length, 26. This is for the 55 lb anchor. The ones offered by Star Bronze may not have the marking as indicated above. although it appears from other illustrations in the catalog that the ABI logo was retained on other products they offered.
Good luck!