Classic & Vintage - miyata 750sr

I'm looking at a Miyata 750sr. No decals....from 1987.
I've seen the 710, but I'm not familiar with this model. I'm curious if anyone is knows enough about this one to tell what the frame material is; or what "sr" signifies.
Since it's a middle number, I suspect this bike falls into the "semipro" or "sport" category of Miyatas, but if one of the experts knows otherwise, or if it leans toward race or toward touring I would appreciate their estimation.
Thanks

I've never heard of a Miyata 750SR. It's definitely not in the 1987 catalog. The 7xx series model at that time was the 712. Do you know the components? How about a serial number?

Thanks T-Mar.
It has a an SR Custom crank,Suntour Sprint shifters, Shimano 600 derailleur, Dura Ace brakes, and a black Miyata badge on the head tube.

Thanks T-Mar.
It has a an SR Custom crank,Suntour Sprint shifters, Shimano 600 derailleur, Dura Ace brakes, and a black Miyata badge on the head tube.

That's an very eclectic component mix! Nothing matches, making it impossible to establish a model or year based on the components.

If it has an actual badge on the head tube, as opposed a decal, then it is older than 1987. The black head badge was used in the very late 1970s and the early 1980s. Having the serial number would help. Also, the seat post size will indicate whether it is one of the entry or mid range models. Once we have those two, we can look at frame details to narrow down the possible model. If you can post or send pics it would help greatly.

I attached some images...I think.
Interesting paint job.
The serial number is J470584.
Thanks again.

It's very early 1980s, circa 1981 or 1982. I have the 1982 catalog, so if you can post the pics, we should be able to narrow things down.

Pics...finally.
Thanks

Thank-you for the pics. Unfortunately, they did not help as much as I thought they would. However, they do confirm that it is not a late 1980s model. There is no exact match with the 1982 catalog, so it is probably 1981. We can safely eliminate the race and touring series. Assuming that most of the 1981 frame features would carry over into 1982, the closest match that I have in the catalog would be a model 210 or 310. Given that the previous owner (?) recalled a model 750SR, there is a possibility that it could have been a the 1981 version of the 710, however, there are substantial differences in the style of the seat lug, stay caps and fork crown. Did you get the size of the seat post? .

The Miyata 750SR was designed especially for Koga in the Netherlands. They however did not sell as well as expected and Miyata therefore had quite a few left over in Japan. They therefore sold them to a number of Canadian shops that bought directly. They had high tensile steel frame and very light wheels. They were better wheels than equivalent Miyata bikes of the day and lesser frames. They never did appear in any catalogue as they wer not meant for the Canadian market, they just happened! If I remember correctly they were labeled as Koga-Miyata and were sold in 1983.

Thanks!

In the mid to late eighties ('85 or '86) our shop in upstate NY sold the 750 SR model. I was told they were brought into the country and awarded/given to the top 5 dealers in the country. I believe each dealer recieved 75 bikes. They were available in gold or blue and they were not in the cataloge. Rare but not special.

Dnalsaam and Miamijim, thanks for the clarification! That's one Miyata I knew nothing about.