P2PK Transactions

I am playing around with the core code trying to implement my own wallet (out of curiosity and mainly to get better grips with internals).

So far this is what i have done
- Launched in regtest mode , generated 101 blocks with mining reward 50.0 BTC paid out.
- Got hold of the chainActive structure and basically trying to implement a version of ScanForWalletTransactions.
- Following the crumbs from the above function leads me to Solver (called via isMine)

Code:

bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);

If I look at the representation of the pubKey script in the reward transaction it looks something like :

Code:

2103d7a738b1e5d4f66470d3439d970661c83e35054408eff625b441967be85caea7ac

Which is decoded to :

Code:

03d7a738b1e5d4f66470d3439d970661c83e35054408eff625b441967be85caea7 OP_CHECKSIG

Looking at the solver , this transactions will not be decoded to TX_PUBKEY as it expects the following in the template

Code:

CScript() << OP_PUBKEY << OP_CHECKSIG

But the getBalance RPC can correctly deduce the balance, so essentially it works.
For the love of god , i am unable to figure out how is the simple script signature of <key> OP_CHECKSIG is added to the wallet. Any tips will be appreciated.

Cheers!