The JRS-1 was a heavily militarized version of the Sikorsky S-43 which was first flown in 1935 and was often called the "Baby Clipper" after it's larger Pan Am big sister, the S-42.
This is the "undercarriage down" version of the model, an "in-flight" version is available here. The S-43 is available here.
"53 S-43/JRS-1 "Baby Clippers" were produced (31 civil, 15 Navy, 2 Marine, and 5 USAAC)...... 10 of the Navy's JRS-1s were at Pearl Harbor on December 7th, all survived the attack and one, BuNo 1063, is undergoing restoration at the Smithsonian today. Two civil S-43s have also survived, one originally owned by Howard Hughes and one at the Pima Air and Space Museum (painted as a Marine JRS-1)." ...from "Sikorsky S-43/JRS-1 Amphibian" by Steve Ginter (ISBN:0996825851)
Please note that some of the fine detail of this model is lost when printed in Versatile or MJF PA12 plastics.