Neo,
Aerospace National (they used to be called Army-Navy) are a 37° tubing flare fitting. SAE fittings are 45° tubing flare fittings. That was what threw me. The AN-10 size is designed to fit 5/8 inch diameter tubing.
It looks to me as if you have some kind of coupler that is pinned to a compression hose fitting. As I cannot see into the "end" of the coupler, I can only guess. Tapered pipe threads are the most common coupler interface. JIC (also called MS, because they started out as a (US) Military Specification) fittings have a straight (UN fine) thread and a radial o-ring seat (for high hydraulic pressure operations) and are the next most common coupler interface. A (slip-fit to tube) weld socket is not uncommon in these types of couplers.
I usually work with swaged-on fittings when dealing is hose. Otherwise (in case you couldn't tell) my hydraulic work is with drawn tube assemblies.