I have to make an inference. I did not own a turntable until about 1966, and it is unlikely that I bought any records before then, tho I owned some, probably given me by my mother, and played them on other people's turntables.

However, in the '60s I had a friend of the I-can-get-it-for-you-wholesale religion, and he importuned me to buy a turntable for my lo-fi thru him, and even offered to fix it so I could play mono records on it (at that time, I thought stereo recording was fashionable frippery; I continued to buy mono records as long as they remained available). Naturally, I hesitated; but then it occurred to me that if I owned a turntable, I could listen to Bob Dylan any time I wanted. So I gave in. That makes it very likely that the first record I bought was an early Bob Dylan one.