It's kinda hard to set a price on a one of a kind item. Your peewee is just that.
I haven't seen another one . What would be the replacement cost of one if you decided later you want one?
How many "regular size" whatever that means, rebels are there compared to peewees.
Years ago Christensen peewee were as high $400.00 depending pattern and type.
Personally I wouldn't seek one out, however if I found one I would be jazzed.
I prefer a particular size Peltiers in my collection and seek out certain sizes and types. There are some folks who want one of each size or one of everything. Then there's the buying on a whim.
I just convinced myself not to do the trade, lol if I were you, lol. Certainly not at the present evaluation of $ that was given.
The person should just buy one if they're our there to be had for $40-60.00, lol.
I've never seen one personally offered ( rebel that is). If I saw one I might buy it, just because in my estimation that's a pretty good deal @$40-60.
I will add, there's also the case of what the market will bare and what you will care to have for it, as in sell it for. I've given away killer marbles, so there's that.
Anyway there's my quarter worth of comment, due to inflation.
Food for thought...