Mel imported lots of entry level bikes during the bike boom days, including mixtes. I even bought and resold a "mid-size" mixte with 550-A wheel/tire size. They all had cottered cranks and low-end Simplex (early) or Suntour (later) components. All the original frames that Mel brought in and branded were sold under the Pinto name. Strangely enough, the first bike-shop-bike I ever bought was a Pinto from Mel's bike shop in DC called The Pro Shop. Most of the singles were actually rebranded Uragos. The tandems were made by Follis or Lejune I believe. According to Mel, he later got a cease-and-desist letter from Ford's lawyers saying he could not use the Pinto name, so Mel changed the branding to Mel Pinto or Mel Pinto Special.

But the short answer to your question is yes, that bike was almost certainly out of Mel's warehouse, and made by Urago.