Here is another example of an early 50 with a spike bayonet. I bought this rifle back in 2017. The first letter on s/n was stamped with the wrong letter, had some rust pitting and came with a laminate stock. But it had a spike bayonet. What it differs from the above early 50 is that it had a 90-degree gas block.
https://ibb.co/album/kP3zJv
https://ibb.co/album/kP3zJv