Well,for my Gazelle,I don't know what particular model it is;a standard Roadster perhaps.It's a 1957 model,I guess,based on its former front SA hub brake.But since it was shot,I've bought two older SA hubs for my bike,a 1946 and 1947.

I've got a SA rear rim,40 spokes;still looking for a front SA 32 spokes rim.
As for the saddle,I've got myself a Brooks vinyl mattress saddle.Yah,I know the leather type is the higher-end type for our bikes,but the used mattress saddle was 'relatively cheaper' and it seems to be less commonly seen on our bikes,as most folks opt for the Brooks leather saddles,or the plastic types if you want it cheap.Furthermore,the Brooks mattress saddle was the first ever item I bought on eBay a few years ago, :-) !

Anyway,it's quite a standard Roadster;hope that I could know more to share with you, :-) !