Have you checked for watermarks? If watermarked, you could be looking at 454 and/or 455. Added: The color of the stamp on the right seems to me to be more appropriate for a 454.
Glad to be of help ... I think. But you've managed to confuse me a bit. When you mention the stamp on the left, are you referring to your original photo or the later photo where you are checking for watermarks? I'm assuming it is likely the latter and, as you stated, the stamps are 454 & 492 ... so the 454 would be on the right in your original photo, the 492 would be on the left.
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