This drum is an oddity so please read through the description and check out all of the photos.
The drum appears to be a 1970's SSB era Grestch 12x18 tenor drum converted to a bass drum. Lugs are a little closer to the hoops, the muffler is a standard tom muffler, and it looks to have had a key holder and leg rest at some point. Rail and all other bass drum parts were added to make a playable "bass drum".
The shell & wrap look to be slingerland era with the 'chocolate milk' interior slingerland was known for at this period. Although the edges seem a bit different than slingerland was doing at this time.
Batter side edge is in perfect shape while reso side has a small ding in it.
All in all the drum sounds and plays beautifully
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