Looking for info on three multi-digit LED assemblies

I have a box of LED displays that I picked up all at once from a Hamfest, probably either Dayton or Mansfield. There are enough similarities between the three types that I figure they are from the same maker. I don't have any easy way to take pictures right now, but I can post the relevant characteristics to see if anyone has any recognition. They seem easy enough to reverse-engineer, so while I'd love schematics or other documentation, I'll be able to use them without. I'm mostly curious what equipment they might have come out of. #1 - the oldest style. Marked "assy 4000123-101". Three double-digit MAN6610 displays with a "336" date code on a "front board" attached to a driver board by dozens of individual 330 Ohm 1/4w resistors used structurally as well as electrically. The driver board has six 74LS47s with date codes of "231". There are four lugs on one short edge of the board with cut wire stubs, E1 and E2 have orange wires, E3 is blank, E4 has a black wire - +5V and GND. The data comes in on 30 individual wire-wrap stakes with the stubs of the old WW wire still on them, BCD data plus latch x 6. #2 - the middle board in age and appearance. Marked "assy 4002244", with 4002243-1 on the front, it's a newer board with a solder mask, and has *five* dual-digit LED displays, HDSP-K121s, grouped as 4 digits and three pairs of digits - as if it could display year plus hrs/min/sec or DOY plus hrs/min/sec. It uses an unusual (to me) driver chip - *nine* of a Motorola MC14543 (date code 9026) which the datasheet tells me is suited for LCD driving. It also has the same power lugs on the short edge, E1-E4 with the same color stubs. There are 49 WW pins around a long and the opposite short edge. They appear to be strangely numbered, first in nine groups of four, then with ascending numbered pins adjacent to the groups (probably BCD plus latch), with the last four pins over on one short edge. Both of these displays have pins that are not aligned nor spaced to permit a ribbon cable or molex or Berg connector to easily attach, and in fact, both still have wire-wrap wire stubs, so they appear to have been somewhat permanently attached to their surroundings. They also take an enormous number of pins, but would be trivial to drive from 4-bit counters and such (thus the newer one would make a perfect display for a DOY+TOD clock made from discrete TTL or CMOS). #3 - much more modern design. Marked 4005935-1 on the back and 4005936-101 on the front. It has nine single-digit hpHDSP-E103 displays (date 852) driven by a pair of Maxim MAX7219CWG (date code 9611) 8-digit clocked-serial-interface LED drivers. It's physically grouped as three digits, then three pairs (DOY+TOD), and comes with a red plexi bezel with "error" over the bottom edge of the "single hours" digit and "dropout" over the bottom edge of the "single minutes" digit. Its connector to the outside world is a keyed and latched 3M 3408 connector - 2x8 0.1" spacing. So do any of these LED assemblies ring a bell with anyone in terms of type or brand of equipment? The only thing that even closely resembles a company name or logo is NTUF-1 near the commonly-seen '94V-0' legend. Thanks for any hints or suggestions, -ethan