[Alan Brinton]

The key springs are fairly typical of later melodicas, except that they are heavier than most, as a result of which the keys are quite springy.
http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838185277&k=xw24HPC&lb=1&s=A
http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838185410&k=76vwZjB&lb=1&s=A
http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838185961&k=xtwLLQm&lb=1&s=A

http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838186089&k=FMpTcph&lb=1&s=A
http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838186177&k=fjThQx7
http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838186334&k=3JhnLCj&lb=1&s=A
The back panel is a slat of plywood, laminated on the inside with some kind of thin hard material and faced on the outside with a decorated metal (aluminum?) plate. The blocks in the narrow corner of each end of the instrument are some kind of hardwood.

http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838186387&k=Tsnb5jG&lb=1&s=A
The moisture valve is a small button, which pushes up a sprung flat piece of copper (or copper alloy). Finally, the end pieces.
http://lucy421.smugmug.com/Other/Silvertone-34/47098611_7tSWZQ#!i=3838186724&k=DNkd6M3

So the Silvertone is like the Clavietta in that it has individual reeds rather than reed plates. It is relatively solid and does not have the look or feel of a toy designed for children. It is not well designed in terms of tuning and maintenance and the difficulty of getting and maintaining a good seal. Although it was quite leaky to begin with, I was able to play some notes, but wasn’t able to make meaningful judgments about the sound.

This particular instrument is a little beat up, but I believe it could be repaired and made playable, and I would be willing to pass it along to someone who is interested and has the requisite skills. No parts are missing, and there does not appear to be any serious damage except to seals/gaskets. The reeds appear to be in very good condition