The MSN-001A1 Delta Plus was an Earth Federation Forces mobile suit introduced in the novel and OVA Mobile Suit Gundam Unicorn. The Delta Plus was a prototype Transformable Mobile Suit (TMS) developed by Anaheim Electronics. Based on the development plan of the MSN-001 Delta Gundam, the Delta Plus incorporated technologies from the Zeta series of mobile suits, as well as operating data from the MSN-00100 Hyaku Shiki. It was developed as an all-purpose attack machine, capable of operating both in
MSZ-006C1 Ζeta Plus C1 - Gundam Wiki, PDF, Military Technology
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So apparently Sunrise is hosting a poll for which next UC series to be animated. : r/Gundam
Gunpla Gallery
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MSN-001A1 Delta Plus, The Gundam Wiki