Model Identification key
Here are some clues how to identify the different HVA rifles
The late FN actions and 1640/1600 can be identified at first look by their safety;
The 1640/1600 have a side sliding safety and the FN have a wing type safety (here a replacement Bueler lever) - The 640 series most of the time, have a beech stock, while the later 1000/1100 (still on FN actions) have walnut stock.
The 1640/1600 action also have a different bolt release latch than on the M/98;
You can also see the factory Stock cross pin on this higher grade (Crown Grade) stock;
The 640 was made on two different actions, but to make it even worse, the FN action evolved itself in at leat three phases (phases pics to comelater)
Here, you can compare both a late and early 640; on a FN action(bottom) and an early one, made from a "commercial" M/38 (M/94) made by HVA (top);
Below are the two different M/94 variant (M/94 and M/38) used by HVA dfor their commercial rifles (civilian)
Top one is the 649 based on a M/38 (Commercial) and bottom the M/46 based on the M/94