On the side of the meter with the LCD display, is there a little two position sw itch marked "ambi flash" directly underneath the button labeled "m-clr"? If so you have a Spotmeter F. You move the switch to the "flash" position to read flas h. On the opposite side of the meter, in big type it should read "Spotmeter F".

If that switch isn't there, and the logo isn't there then you bought a Spotmeter M, which is (or was) made concurrently with the Spotmeter F.

The one major drawback of the Spotmeter F is that you have to use a sync cord so the meter can trigger the flash, there is no non-cord capability.