Frame
No. There are several different calibers that are called 9mm. These calibers are not interchangeable. A quick rundown of 9mm pistol cartridges: 9x17 also called 9mm Kurz, 9mm Short or .380 Auto 9x18 Makarov, also called 9mm Makarov 9x19 also called 9mm Luger, 9mm, 9mm Para, 9mm Parabellum 9x21 also called 9mm IMI 9x23 also called 9mm Long, 9mm Largo
browning used the last two digits of the year before the serial number on the 9mm from 1970 until 1976 so your 9mm was made in 1973
Not properly
There are about a dozen cartridges that have 9mm as part of their name. If you mean the 9mm Parabellum (sometimes called 9mm Luger) it is longer than the Makarov, not as fat, and has more power. The 9mm Makarov is actually 9.27 mm.
Exactly how is the pistol marked? 9mm browning serial number 72C44338
If you mean 9mm Parabellum (also called 9mm Luger)- no. the 9x18 (Makarov) is fatter and shorter than 9mm Parabellum. It is not a true 9 mm.
NO- outside of case dimensions, the 9x18 uses a .366 bullet designed for the Makarov. The standard international cartridge, 9mm Luger (9x19) uses a .355 bullet. The Luger will not fit in the Makarov, and if you try to fire the Makarov in a standard 9mm gun, you may just damage the gun or blow out the barrel
Depending on how old or new it is - on the slide, frame, barrel hood.
Can't be answered without the serial number.
The serial number.
1986
Look on the frame