Based on the description, the bicycle in question would appear to be a late 1970s model RM-30. At his time, the model was 4th in a line-up of 5 adult, lightweight bicycles.

Sekine Canada produced bicycles from 1973-1983, in an old RCAF hanger just outside Rivers, Manitoba. The base had been taken over the Department of Indian Affairs and renamed Oo-za-we-Kwun (Yellow Quill). It housed a number of companies which employed a large number of aboriginal people in the workforce. As Im Fixed states, the driving force in establishing Sekine Canada was avoiding the import duties being imposed on Sekine's Japanese manufactured bicycles.

The Canadian manufactured models were well built and received. Like most Japanese bicycles of the era, the early models emphasized sturdiness over light weight and consequently have a somewhat dead ride compared to European bicycles. This characteristic disappeared over time, as the Japanese improved their tubing technology and frame geometries. The brazing and paint on the frames was extremely well done, and the bicycles were competively priced, resulting in models that outsold the domestic CCM models, with the exception of the entry level CCM Targa. Overall, Sekine was probably the best selling 10 speed in Canada, in the mid 1970s. While hugely popular in Canada, the brand had limited distribution in the USA.