If the security when so purchased is an unissued security, the period applicable to the transaction under subparagraph (2) of this paragraph shall be 7 days after the date on which the security is made available by the issuer for delivery to purchasers.
* * * is to recognize the fact that, when an issue of securities is to be issued at some future fixed date, a security that is part of such issue can be purchased on a "when-issued" basis and that payment may reasonably be delayed until after such date of issue, subject to other basic conditions for transactions in a special cash account. (1962 Federal Reserve Bulletin 1427; 12 CFR 220.118 ; ¶ 5996, Published Interpretations of the Board of Governors.)
In that situation, the Board distinguished the case of mutual fund shares, which technically are not issued until the certificate can be delivered by the transfer agent. The Board held that mutual fund shares must be regarded as issued at the time of purchase because they are:
* * * essentially available upon purchase to the same extent as outstanding securities. The mechanics of their issuance and of the delivery of certificates are not significantly different from the mechanics of transfer and delivery of certificates for shares of outstanding securities, and the issuance of mutual fund shares is not a future event in the sense that would warrant the extension of the time for payment beyond that afforded in the case of outstanding securities. (ibid.)
The issuance of debt securities subject to delayed issue contracts, by contrast with that of mutual fund shares, which are in a status of continual underwriting, is a specific single event taking place at a future date fixed by the issuer with a view to its need for funds and the availability of those funds under current market conditions.
12 C.F.R. §220.123