I was wondering if anyone has some info on a trombone I recently bought. I can find virtually nothing about it myself, but have to admit that I am still getting into trombones. I just started little over a year ago

So, the question is regarding an Olds 25, red bell, with valve and open wrap that extends beyond the trombone bell.
Bell inscription:
OLDS
elkhart, ind.
U.S.A
serial nr: 489xxx
on the tubing it reads 'nr25'
Case: quite regular black hard-case with a little plate with a logo: 'O Olds' in a square, with the 'O' in white on black, and the 'Olds' in black on a white background.
The seller wasn't the original owner, and believed it to be similar to a 4b. I honestly cannot tell with my limited experience, having only played the courtois 150 and Pbone before this one

If anyone could tell me about the age, perhaps the original purpose of the horn, a similar more well known instrument etcetera? I'd like to know some more about this one.