https://www.ebay.com/itm/1920s-BIGE...959335?hash=item59503858a7:g:yNgAAOSw8Ehe7V0E Not mine, and not affiliated with the seller. These are fairly scarce, and usually are priced around $50, though I've seen them go as high as the $100 mark. These are the very best of the "micro" razor style of razors. They shave very similarly to a Cooper Monobilt. They also tend to slip through TSA scans with a blade loaded. It wasn't intentional, and I don't recommend trying.
