Response from Jonathan: Richard,

Based on that number, it looks like you have a Wells Gardner D9200 series monitor. Flybacks have been tough to come by for this chassis recently. With that said, it looks like Betson Imperial may have them in stock. We would recommend calling them up and confirming with them that they have the flyback in stock and that it is compatible with your chassis. Link: https://www.betsonparts.com/flyback-d9200.html

Hope that helps. Thank you for your question and good luck with your repair.