The side board bases do vary. The one in the #557 photo has door bases that are outside the case, thats the last version (1923-1925, same as on the Southern #1401 in the Smithsonian). The cast alluminum case was new in about 1927.
Yours is the same 1923-1925, last version, withthe bases mounted on the outside of the case. The number boards can be either inside the case, or outside the case. In both models the rivets still are in the same location. Inside version is pre-1923.
I can tell by the rust pattern that yours is the last last version case . Look at the photos on the net, or the number board door bases, and the differences will start to become clear. Your case can accept any nuberboard base that is mounted on the outside of the case (1923-1927+ versions). That same numberboard base can take any Pyle-Natioanl number board door, they are backwards compatible, so you have your choice of door: flat, or 30-degree tapered.
See how the numberboard cover door on the #557 has only two hinge lobes (for lack of a better term), some have three. The two-lobe version is about 1918 - 1923, the four lobed version was used on the 1925 light and also on the cast alluminum case that started in 1927 and lasted untill steam ended. The three-lobed door is the last version and it will mount on any of the bases wheather inside the case or outside.
The front doors with the raised lettering, like yours, is also one of the last versions and is post 1920, probably 1923-1930.
There was one different door latch, it had a long crescent shaped latch that was the same as those used on the SUNBEAM lights. It was quicker to open than the butterfly nut on yours (and mine). I am not sure if the crescent latch was optional early or just showed up in 1923 or so.
I own a 1920 version that has the inside numberboard door bases and the two lobed number doors, its in an old post, here; viewtopic.php?f=1&t=31800&p=161640&hilit=pyle+light#p161640
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