Papilionanda Tan Chay Yan, resulting from a cross between the amphidiploid JVB (4n) and a typical diploid Vanda (2n) to yield a fairly uniform seedling batch, JVB hybrids made with other polyploids have tended to yield a surprisingly wide range of sibling variants. [Emrys Chew 2017-03-17]

Through the intervening decades it has been assumed that Pda. Tan Chay Yan 'SBG #770' and Pda. T.M.A. were practically synonymous. This orchid whodunnit has taken an unexpected turn, however, with preliminary results from DNA sequencing of the original Tan Chay Yan revealing no genetic contribution from either V. dearei or V. sanderiana. Perhaps we will never know which 'sanderianised' hybrid served as the pollen parent of one of Singapore's greatest heritage orchids. [Emrys Chew 2017-06-19]

History Papilionanda Tan Chay Yan made its international debut 65 years ago. Raised at the Singapore Botanic Gardens under the code number SBG 770, it was named for the originator’s father.
On 25 May 1954 a select cultivar ‘Pride of Malaya’, air-flown from Singapore and exhibited by Mrs. Gracia Lewis, famously won a Gold Medal and FCC/RHS at the Chelsea Flower Show. Its large, flat blooms were sensational and yet subtle: imbued with the radiance of a tropical sunset, a rich blend of golden apricot and salmon pink.
Emrys Chew

• Vanda Tan Chay Yan Robt.Tan (1952)

Papilionanda Frances France	Papilionanda Tan Chay Yan × Papilionanthe Miss van Deun
Sealara Mary Seal	Papilionanda Tan Chay Yan × Paraphalaenopsis denevei
Mayara Prince Norodom Sihanouk (6)	Papilionanda Tan Chay Yan × Renanthera coccinea
Mayara Joan Mah	Papilionanda Tan Chay Yan × Renanthera storiei
Papilionanda Quek Beng Guan	Papilionanda Tan Chay Yan × Vanda Eisenhower
Papilionanda Ng Keng Soon	Papilionanda Tan Chay Yan × Vanda Ellen Noa
Papilionanda Sek Hong Choon (1)	Papilionanda Tan Chay Yan × Vanda Ernest Fujinaga
Papilionanda Madame Poon Wah	Papilionanda Tan Chay Yan × Vanda Frank Crook
Papilionanda Swee Kim	Papilionanda Tan Chay Yan × Vanda insignis
Papilionanda Mok Choi Yew	Papilionanda Tan Chay Yan × Vanda Jennie Hashimoto
Papilionanda Ohuo de Paris	Papilionanda Tan Chay Yan × Vanda Ohuohu
Papilionanda Sweet Betty	Papilionanda Tan Chay Yan × Vanda Oriole
Papilionanda Henry Whitesell	Papilionanda Tan Chay Yan × Vanda Robinson's Tank
Papilionanda T. S. Kuah (1)	Papilionanda Tan Chay Yan × Vanda sanderiana
Papilionanda Yeoh Bok Choon	Papilionanda Tan Chay Yan × Vanda Tatzeri
Papilionanda Mimi Palmer (43)	Papilionanda Tan Chay Yan × Vanda tessellata
Papilionanda Agong Putra	Papilionanda Tan Chay Yan × Vanda tricolor
Papilionanda Zunori	Papilionanda Chia Kay Heng × Papilionanda Tan Chay Yan
Papilionanda Lee Shew Lee	Papilionanda Josephine van Brero × Papilionanda Tan Chay Yan
Papilionanda Mines	Papilionanda Mevr. L. Velthuis × Papilionanda Tan Chay Yan
Papilionanda L'Or de Paris	Vanda Kultana Gold × Papilionanda Tan Chay Yan
Papilionanda Sharon Soosay	Vanda Rothschildiana × Papilionanda Tan Chay Yan