History of this musical instrument you have shared.History of such instruments i have i did not get any where else. searching for the website of saleonleather online shop for the singers costumes https://www.saleonleather.com

Https://www.roland.com/global/products/fr-4x/
https://www.roland.com/us/support/knowledge_base/203033135/
https://www.long-mcquade.com/74269/Band---Orchestral/Accordions/Roland/V-Accordion---Red.htm
https://www.gear4music.com/Woodwind-Brass-Strings/Roland-FR-4X-V-Accordion-with-Keyboard-Black/1PBQ
https://www.gumtree.com.au/s-nsw/keyboard+piano+roland/k0l3008839