"Mrs. Mary Thomson" a rose bred locally to suit Australian conditions.. the breeder George Thomson is an Australian amateur rose breeder,
known for creating disease-resistant roses tailored to the Australian climate.

Thomson was born in Scotland and trained with Alex Cocker of Cockers Roses in Aberdeen, also completing an apprenticeship at Kew Gardens.

In 1958, Thomson emigrated to South Australia, settling in Willunga, near Adelaide. He is considered to be one of Australia’s most productive rose breeders, planting over 350,000 seeds each year.
He works closely with long established rose nursery Ross Roses, contributing new roses to its ‘True Blue’ collection, which is bred specifically for the Australian climate. (Wiki.)

Released onto the market 1996 - very fragrant. A shrub rose, but mine has been
grafted onto a stem because I saw it growing this particular way in the nursery.
The "Valentine" connection is that the rose was named for either his wife or his mother.