No one is more surprised than me that I was actually able to put my hands right on it.
Here's a scan of part of the front jacket:
(http://www.dsboards.com/images/Andy_Shadows_front.jpg)
And a scan of part of the back:
(http://www.dsboards.com/images/Andy_Shadows_back.jpg)
I did a bit of research on Wikipedia and apparently the LP was released on October 6, 1969, while DS was still doing the 1897 storyline.
And at this point I have no idea who Loadstone were. But how much of a fluke is it that, considering so many seem to confuse Barnabas' name as Barnaby, their record label was Barnaby records...