a very common Juniper chinensis cultivar that was planted widely from the 1930's through to the 1970's was J. chinensis 'Blaauw'. It was over planted in fact, sort of the 'Bradford Pear' of foundation plantings. After about 1975, 'Blaauw' began to fade in popularity, other cultivars were more frequently planted. If these junipers look fairly blue on summer foliage, this may very well be the cultivar. 'Blaauw' does turn bronze in winter.
The clone 'Blaauw' in mature foliage looks a lot like Shimpaku, but fairly blue in color. 'Blaauw' will revert to juvenile foliage with less provacation than Shimpaku. It also is not as tight, or finely branched as 'Shimpaku' but its foliage is better than many of the J. chinensis cultivars for bonsai. Kishu & Itogawa are the best, 'Blaauw' is definitely inferior to them, but it is good enough that if the nebari and first 12 inches of trunk of one of these is interesting, it might be worth working with.
To my eye, I would guess 'Blaauw', I had one for a number of years, until it went to the great compost heap. But of course from a photo I am only guessing, it could be anything.
