Martin "Handcraft model from about 1927. "Low pitch" means it is tuned to A=440 Hz, which is the international standard. Sweet sounding horns, worth holding onto as a player.
See what Martin altos of that vintage are going for on eBay. Yours would not be a top dollar example because a relacquer and past repairs are always a hit against the value, but your pictures show newer pads, which is important.