There are original Conlon photos with just his writing.
There was a series of forged Conlon stamps, the photos also containing his writing and signature. However, I'm not aware that any of the forgeries had just his writing (no stamp). So a learned opinion/comparison of the handwriting would solve your question.
P.s. The forged stamp was unique in design, meaning it didn't match Conlon's known real stamps and so can easily be identified.
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