I'm trying to get some history for my old Hi Power.  It's in good shape (80-85%), and seems to be original. 
It has a four digit serial number, a standard grip (no slot), and fixed sights.  No Nazi markings.  It has the spur hammer - not a loop. 
Any thoughts as to the manufacture date?  Any way to tell if it was produced in occupied Belgium? 
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Does it have the "thumbprint" on the right side of the slide?
Any markings on the heel/butt?

If made in Occupied Belgium it would have Waffenampts.

The spur hammer is not correct, should be a ring hammer.

Internal extractors and the "thumbprint" were discontinued around 1962.

Thanks for the info.  Knowing what to look for (internal extractor, thumbprint, heel markings...) really helps. 
- No thumbprint on the side.
- The bottom front of the butt is marked "LGKT" with  "0780" underneath. 
- No Waffenampts. 
- If FN discontinued the thumbprint a couple of years -before- the internal extractor, mine was probably made in the early 1960s. 

I scoured the internet, and found that "LGKT" indicates LandesGendarmerieKommando, Tirol (Rural Police Command, Tirol). 

Here's a similar Hi Power on Gunbroker that says it was made in 1955.  Based on your info, and other stuff on the net, I don't think that date is correct.  I can't believe the price!!
http://www.gunbroker.com/item/651207471

Condition, rarity and accessories. For hardcore HP collectors that is a good one. Glad I'm a accumulator and not a collector.

I wouldn't go anywhere close to two grand on that auction. For one the rear sight looks to be a MKII rear sight and someone has monkeyed with the front sight by putting grooves in it.