Ovation 1687 r what does the r stand for

Question edited for clarity, 'make model (what it is)' and CAPS for proper names.

http://www.ovationtribute.com/Date%20your%20Ovation.html
E+4 Digits 1973 (Jan)-1975 (Feb)

CTRL+F type 'ovation', there are 3 variations. You have one number too many.

http://www.ovationtribute.com/O_Decoder/O-Decoder%20rev8.htm

https://www.google.com/search?q=ovation+serial+number+lookup

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didierpuech.free.fr/guitares/ovation/identification.html

manualslib.com

That is a model number you have quoted

1 - Ovation
1- Acoustic roundback and hollowbody electric
1- Standard bowl
1- Balladeer model
and -1 is a colour code

Your serial number will probably be a letter followed by 3 to 6 digits eg "E3689"

It was built in 1979. The 6 digit serial numbers do not tell us the material.
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An Ovation Model 112 is called a Ballader. These are USA made guitars.Value would depend on condition, but I've seen them sell on the used marker for $400.

contact or search ovation for info also look at Kamen musical instruments they made ovation guitars

Yup. It sucks pretty bad.