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Look for the old solid brass models, but never the freshly-polished models; these may not be real or damaged. Transits were made for many years and there are a lot of models available to collect.
Old instrument catalogs are good as well, but harder to find because they have a lot of valuable information for antique collectors and dealers.A nice old label with the maker's name inside the box cover is always an added bonus with any instrument.Old surveying transits are fun to look at and can be educational to learn how to use (or use again).Collecting antique surveying instruments, books and memorabilia can be a lot of fun if you follow a few simple guidelines.Start out slow with smaller, less expensive items that don't cost an arm and a leg.
Older or more rare makers may sell for more money depending upon condition and other factors.