That's the beauty of Photoshop - there are many different ways to achieve the same effect!
Looking through some old photos I've noticed that the 'sepia' toning is very variable from one to another - some are very brown whilst others are much more subtle; perhaps it's not toning, as such, but just a warmer base-colour in the paper.
One of the hardest things to simulate is the 'smooth' effect you get through old photos often being contact-printed from quite large negatives coupled with the softness of less than perfect lenses albeit not being 'stretched' by any enlargement. And, of course, old film was more likely to have been orthochromatic (a job for the channel-mixer in Photoshop!)
I've done a different version of my original shot with a different tone, more extensive feathering of the sharp middle-circle and some vignetting in the corners
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