So, I reached out to Dickson and Son and received some interesting info about this particular rifle.
I was made by them in 1901 for "stock" and not as a special order "bespoke" rifle. The ledger book does not show the name of the buyer.(Apparently, only bespoke guns had names of the buyers entered in the ledger). They did mention that the Hunter-Blair family had been a customer for many years. The serial on top of the barrel is indeed a Dickson applied serial number. They do not know what the trigger guard number(1760) signifies. The same number is also located on the left side of the receiver wall right under the wood line. Having looked at the similar trigger guard applied numbers, this one appears very similar to a Rigby serial numbers. Could this be possible that the unfinished Mauser action was purchased originally by Rigby and then sold by to Dickson, who then completed the rifle? I believe the serial( if Rigby’s) places it in the same time frame?
Here are some pictures:

https://www.dropbox.com/s/7taiubflu18m0d5/IMG_4908.HEIC?dl=0
https://www.dropbox.com/s/h6bqw3ux31pf4fw/IMG_4923.HEIC?dl=0