G'day again Jim P,

I guess that makes your double-sided harmonica the Echo harp model: straight sides (meaning that it's tremolo-tuned, not octave-tuned) with "turned-in" ends ... probably fixed with a pair of brass pins at each end. This is (by my oldest catalog) the 54/64 model (32 small apertures a side ... equivalent range to an 8-holed vamper) or the 55/80 model (40 holes a side - equivalent range to a 10-hole vamper)or, just maybe, the 56/96 model (48 holes a side - equivalent range to a 12-hole vamper). Oh ... I have just found, in a more recent catalog, that there is also a massive 57/120 model (range of a 15-hole vamper... !) ... but it only comes in C & G, not the A & D combo you have, or the Bb & F, Bb & Eb ... or C & Amin (...!) that are available in some of the smaller sizes.

Anyway, being tremolo-tuned, it's unlikely that they will have valves (except, maybe, the 57/120 model)... and the sides (should) proclaim they have "Bell Metal Reeds" - an alloy of copper with a fair amount of tin ... so they are even less likely to corrode, under normal usage, than the copper-zinc alloy of the usual brass reeds. I would be confident to sluice the Old Spice away ... then quickly tap out excess moisture and let the harmonicas dry in in a warm airy spot. (Repeat if really necessary ...) Do the washing with the cover plates in place, as that will help keep the wooden frames straight while they dry.

Regards,

Bob