How to Obtain Expert Identification of Your Own Artifacts

I have an ancient lamp and what I call a medallion with a bust on it in relief that I purchased from an Arab lad’s cigar box of miscellaneous items while visiting Jordan and Israel in 1957. I have long been eager to get an expert’s judgment on these items as to their age and pedigree. I could have close-up photos taken of these or would 030attempt to get them sent by some means to someone who could give me the expert evaluation that I desire. Could you suggest how and who may be able to help me in this matter?