Regarding David's post, I could go with Jameson too. You often see important sales of a similar coin referenced on tickets, but that doesn't always mean it was from that collection. Just look at the references of many lots in current sales to see things such as Brooker xxx same dies for Charles I, Adams for pennies, Schneider for hammered gold etc. The collection referenced is usually one of the major sales for the material in question. Unfortunately however, sometimes these get incorporated into the provenance of a sale lot, leading to ongoing confusion when checking and confirming a provenance. I got caught out recently on that very point. Mea culpa for not checking thoroughly in advance. Note that Jameson died in 1942 and the collection was sold post mortem, but the ticket says SPK 1941, i.e. it predates this.
PTO means please turn over.
TPP is T/-/- and looks to be a purchase price code in pounds shillings and pence. i.e T represents a number of pounds and the dashes zero shillings and pence.
I'd say they are by a different hand. Although the M is similar, the P is completely different. The R is a bit misleading as it is a conjugated A&R (for silver) on the ticket in question. The lack of sale price would imply a coin sold before being priced and on the list and so a Spink ticket cannot be ruled out, but I don't think it is. The other ticket references the Sydenham sale at Glens in Dec. 1941, but I don't have this catalogue, nor the Nov. 1948 sale to check who bought what.
Send Chris Perkins a PM to get approved. He doesn't pop by that often.