Given the age and lack of markings your best bet would be to sweep them for a peak at 455 KC's or another common IF frequency. As a general rule IF transformers have four leads (two in, two out) and detector transformers have five as the secondary winding is center tapped.
If you want to play a hunch, the letters " MFP " were often stamped on military gear that had been treated with a mold and fungus preventative coating. Generally had a pale yellow color and once you've seen it you'll always recognize it. If you have way too much spare time, CLICK HERE to visit the BAMA web site, military section,
where you can surf radio field manuals that might show a T-208 in the IF strip.
The MFP doesn't mean it's military surplus, but that's about the only time I've seen those letters stamped on a radio part.....