Guys, I'm relying on you yet again...my neighbor, an elderly retired navy man brought me this deceptively heavy box of..printing blocks? Didn't go in to detail, but he said they were from the war...here's what I see so far...on the first 2 of 7 blocks... "Interior communication and action cutout switchboard for u.s. Destroyers DD692 class year of production 1943-44 Westinghouse order ny-39000-y instruction book 31-100- (something I can't make out)...the others are all different...any idea what I've got here?

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