I received Hoya sp. EPC-610 aff. acuta as a cutting in a trade with a Hoya enthusiast in North Carolina in the summer of 2016 and flowered it for the first time in May of the following year. It has always grown in an artificial environment and been a very slow grower. In the summer of 2018, it flowered on three separate peduncles. The flowers are highly scented and last about five days. The leaves vary in size topping out at about 3 inches in length; they are scalloped and highly attractive.
I’ve unfortunately got nothing else on the plant other than an Epiphytica accession number. Great plant if you can find it for the collection.